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Opinions on this BMS
#1
Hello;
I am interested in opinions on using this for my 7s80p battery BMS.

https://www.electriccarpartscompany.com/...EQUALIZERS


I am struggling with Stuart Pittaways system (old eyes and not good skills trying to build the boards {I am having about a 50% success rate on boards running correctly and keeping the controller up and running.

I am not opposed to using Batrium, just have not gone their yet.

Bob
Bob - has trouble wiring a 3-way switch Blush
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#2
Very happy with them, I have 14S140P, I have a BMS to cut in OV or UV but these maintain the system mostly balanced. If your packs are not correctly matched in capacity there no BMS or balancer than can correct this.
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#3
Above is ONLY balancers without ANY feedback. So you still need to complement a BMS to it and a feedback so you know whats going on. personally i would not recommend it at all because people dont know if they are balancing or not. Yes people state the battery are in balance and therefore its working... But how do you know?

Lets say you drive 150km/h on the road.. Just because the police havent pulled you over doesnt make the speed legal Tongue

Buying above when planning to buy batrium or other is just to throw money in the lake because above is dead darn expensive to what they actually do. The balance current is rather low at voltage ranges diff like 100mV. They only balance at full current when voltage diff is like 2V....
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#4
Thanks for the responses guys.

I have 2 devices that alarm when the packs get to far out of balance. That is what I was using before and they seemed to serve my purpose rather well.
My 18650 packs aren't the best (previous sentence), I thought the balance current and specs (50mV) sounded pretty good for keeping the packs stabilized.

Their may be a Batrium in my future.
Bob - has trouble wiring a 3-way switch Blush
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#5
(01-13-2019, 11:08 PM)BobinTN Wrote: Hello;
I am interested in opinions on using this for my 7s80p battery BMS.

https://www.electriccarpartscompany.com/...EQUALIZERS

Hi Bob, 

your BMS looks interesting, I am also in the middle of consideration what kind of BMS I am going to use. I don't like that most of those cheap BMS use resistors to balance the pack where the extra energy goes to heat... I like the idea of using supercapacitors for balancing, but havent seen anyone using it, something like this one
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#6
Satirasis: The link in beginning is not a bms. Its just a balancer...

Your link is a better BMS. Note that when you need to balance that much energy compare to wasted into heat using passive... you have serious problem with your battery bank from the start.

The cost going active is so much more so that the money saved is rather litle and it takes years before you can make that up. I use passive only on my 100kWh battery bank and I hardly balance anything.
Korishan likes this post
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#7
Yes, if balancing more than a few 100mA is required on a continual basis, there's something wrong with that pack. Find the leaker and replace it. Otherwise, you're basically burning money and tossing it into the wind.
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#8
Yeah, I thought that just carefully compute to have each parallel group the same capacity should be enough. Do you please have some more info for those passive balancers that you are using? Thanks
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#9
The passive ones that Daromer is using, as many others, is the Batrium BMS. It comes with passive balancing boards.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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#10
The active balancers on your link work great on a battery that won't stay in balance. I been using it on my 220 ah lifepo4 pack. Without out those balancers 1 cell always charges faster then the other 3, I been using them almost a year and pack has been in perfect balance. When I built my pack with 160 x 5.5 ah 32650 cells, I never tested each cell for capacity and suspect that is where my problem. Its too much hassle to take the pack apart to test every cell and so far the active balancers have been doing a good job for me. The cost on these were 92 dollars when I bought it for a 4s model, price has gone up since then. 


Recently I saw other active balancers on ebay but there no reviews on how well they work, a 4s model cost 39 dollar and is suppose to balance at 3 amps this is the name of it on ebay (12V 3 to 4 Series 3.7V LiCoMn Lithium battery Active Balance board BMS Inductor)
FEATURES
5-50mV deployment of unbalanced pressure difference between two arbitrary cores
Can be configured to charge, discharge, start equalization at rest
High Frequency current Peak of active Equalization inductor up to 3A
Active equalization frequency up to 200KHz
Jiantao, 94 V-0 level KB high fire prevention level double glass fiber board
Active Equalization to support Unbalance of Multicompound Lithium Battery
Maximum cascade stacking to 16-string active equalization
Very low power consumption, SHIP mode power consumption 85uAn Standby mode power consumption 400uA
Standard I2C communication interface support, accord with SMbus communication protocol
Each equalization channel has a corresponding temperature probe



And I saw these on batteryblocs website, they have a video on there use in youtube. They bleed the cell at more then 1 amp and one thing that it does is it has an alarm that will sound if the voltage goes too high or too low. These are 13.50 each. Its better then the bms built-in ones that balance at less then 65ma.
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